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wanderingmathematician
  • Member for 7 years, 11 months
  • Last seen more than 2 years ago
9 votes
4 answers
8k views

Direct product vs direct sum of infinite dimensional vector spaces?

6 votes
1 answer
169 views

Meaning of "simplicial complex" in combinatorial group theory

5 votes
1 answer
239 views

For E of finite Lebesgue measure, is $f(t) = \int_E \cos(tx) dx$

4 votes
1 answer
124 views

Good source of measure / integration computation problems to build intuition?

4 votes
1 answer
750 views

Evaluate the integral $\int_0^1 x^p (1-x)^{-1}\, dx$

4 votes
1 answer
340 views

Prove $C_b^j (I, \mathbb{R})$ is a complete space

4 votes
2 answers
773 views

What is the 30th term of this sequence (math GRE)?

4 votes
0 answers
58 views

Solvability of group presentations with 2 "almost disjoint" relations

4 votes
1 answer
307 views

Proving condition is sufficient for long term existence of ODE solution

3 votes
1 answer
781 views

Need clarification of Hatcher's definition of $\Delta$-complex

3 votes
1 answer
128 views

Proof that finite symmetrized relator sets, which are $C'(1/6)$, with equal normal closures are unique

3 votes
1 answer
651 views

Defining contravariant left/right-exact functor with opposite category?

3 votes
2 answers
461 views

What is the universal cover of $S^1 \cup_f D^2$?

3 votes
1 answer
263 views

Can I obtain a unitary block matrix from any invertible matrix?

2 votes
0 answers
38 views

Regularity of solutions to a quadratic program?

2 votes
1 answer
2k views

Prove coordinate-free formula for the exterior derivative using Cartan's magic formula

2 votes
1 answer
56 views

Computable functions on sets other than the integers?

2 votes
0 answers
751 views

Different definitions of derivation at a point

2 votes
1 answer
600 views

G a group, H a subgroup of finite index. Proof that G is hyperbolic $\Leftrightarrow$ H is hyperbolic?

2 votes
1 answer
926 views

When is a complex function conformal on the Riemann Sphere?

2 votes
2 answers
2k views

Counterexamples for $G \times H$ isomorphic to $G$ implies $H$ trivial.

2 votes
0 answers
1k views

How to find stable and unstable manifolds for nonlinear ode?

2 votes
1 answer
637 views

General solution to nth order linear inhomogeneous ode

2 votes
0 answers
52 views

What are the matrix coefficients of the $SO(3)$ irrep of dim $k = 2m + 1$?

2 votes
0 answers
31 views

Does the set of irreps of a compact Lie group carry an algebraic structure?

1 vote
1 answer
128 views

Every group is an F-algebra, but is every F-algebra (of the right signature) a group object?

1 vote
2 answers
164 views

Can a uniformly continuous derivative fail to be absolutely continuous?

1 vote
0 answers
118 views

How to bound max of abs. val. of sums of random variables?

1 vote
0 answers
236 views

Problem classifying ODE's

1 vote
0 answers
1k views

Let R be a ring viewed as an R-module over itself, and prove that $Hom_{R-Mod}(R,M) \cong M$ as modules.